diff --git a/scss/_popover.scss b/scss/_popover.scss
index 39f5542eda..d8c0db5c27 100644
--- a/scss/_popover.scss
+++ b/scss/_popover.scss
@@ -108,7 +108,8 @@
   font-size: $font-size-base;
   background-color: $popover-title-bg;
   border-bottom: $popover-border-width solid darken($popover-title-bg, 5%);
-  @include border-radius(($border-radius-lg - 1) ($border-radius-lg - 1) 0 0);
+  $offset-border-width: ($border-width / $font-size-root);
+  @include border-radius(($border-radius-lg - $offset-border-width) ($border-radius-lg - $offset-border-width) 0 0);
 }
 
 .popover-content {